Fermi-LAT detection of A new starburst galaxy candidate: IRAS 13052-5711

• Main Authors: Xiang, Yunchuan, Jiang, Qingquan, Lan, Xiaofei
• Format: Journal Article
• Language: English
• Published: 30-07-2023
• Subjects: Physics - High Energy Astrophysical Phenomena
• DOI: 10.48550/arxiv.2307.16107

A likely starburst galaxy (SBG), IRAS 13052-5711, which is the most distant
SBG candidate discovered to date, was found by analyzing 14.4 years of data
from the Fermi large-area telescope (Fermi-LAT). This SBG's significance level
is approximately 6.55$\sigma$ in the 0.1-500 GeV band. Its spatial position is
close to that of 4FGL J1308.9-5730, determined from the Fermi large telescope
fourth-source Catalog (4FGL). Its power-law spectral index is approximately
2.1, and its light curve (LC) for 14.4 years has no significant variability.
These characteristics are highly similar to those of SBGs found in the past. We
calculate the SBG's star formation rate (SFR) to be 29.38 $\rm M_{\odot}\
yr^{-1}$, which is within the SFR range of SBGs found to date. Therefore, IRAS
13052-5711 is considered to be a likely SBG. In addition, its 0.1-500 GeV
luminosity is (3.28 $\pm$ 0.67) $\times 10^{42}\ \rm erg\ s^{-1}$, which
deviates from the empirical relationship of the $\gamma$-ray luminosity and the
total infrared luminosity.
We considered a hadronic model to explain the GeV spectrum of IRAS
13052-5711.